下面这个xml
文件，要找的路径是"WTTData"Component"ComponentData"ComponentData"ObjectQueryBuilder 找属性field为datastore的expression节点的value值．
<WTTData>
<Component SetName="Explorers"
GroupName="JobExplorer">
<ComponentData Name="JobExplorer"
Version="2.2.2098.0">
<ComponentData Name="HorzSplitter"
Version="2.2.2098.0">
<Data Position="185" />
</ComponentData>
<ComponentData Name="VertSplitter"
Version="2.2.2098.0">
<Data Position="150" />
</ComponentData>
<ComponentData
Name="TabbedObjectTreeControl" Version="2.2.2098.0"
Visible="True">
<Data SelectedTreeNodePath="$"
CurrentTab="0" />
</ComponentData>
<ComponentData Name="ConfigurableListControl"
Version="2.2.2098.0">
<Column Name="" Width="32"
SortIndex="0" SortOrder="None" ColumnOrder="0" Default="True"
/>
<Column Name="Id" Width="70" SortIndex="-1"
SortOrder="None" ColumnOrder="1" Default="True" />
<Column
Name="Name" Width="352" SortIndex="-1" SortOrder="None" ColumnOrder="2"
Default="True" />
<Column Name="AssignedToAlias" Width="80"
SortIndex="-1" SortOrder="None" ColumnOrder="3" Default="True"
/>
<Column Name="FullPath" Width="190" SortIndex="-1"
SortOrder="None" ColumnOrder="4" Default="True" />
<Column
Name="LastUpdatedTime" Width="150" SortIndex="1" SortOrder="Descending"
ColumnOrder="5" Default="True" />
</ComponentData>
<ComponentData Name="QueryBuilder"
Version="2.2.2098.0" Visible="True">
<ObjectQueryBuilder
ControlType="Microsoft.DistributedAutomation.UI.QueryBuilder"
ControlAssembly="Microsoft.WTT.UI.Controls.ObjectControls" Assembly="WTTOMJobs"
Type="Microsoft.DistributedAutomation.Jobs.Job" Title="Job
Query">
<Expression Index="1" Static="True" AttachWith=""
Mapping="DataStore" Field="DataStore" Operator="Equals" Value="WTTMobile1"
/>
<Expression AttachWith="And" Mapping="Id" Field="ID"
Operator="Greater" Value="733454" />
<Expression
AttachWith="And" Mapping="Id" Field="ID" Operator="Less" Value="733740"
/>
</ObjectQueryBuilder>
</ComponentData>
<ComponentData Name="ToolBar"
Version="2.2.2098.0">
<Data
DefinitionController="WTTMobile1" HideQueryBuilder="True" HideHierarchy="True"
MaxItemsToDisplay="500" />
</ComponentData>
</ComponentData>
</Component>
<ActiveComponent
SetName="Explorers" GroupName="JobExplorer" />
</WTTData>
实现代码是：
{
{
xDoc.Load(filename);
xElem1 = (
{
dataStoreString = xElem1.GetAttribute(
}
}
}
１，定义一个XmlDocument对象xDoc
2,通过XmlDocument来load需要读取的xml文件
３，通过XmlDocument的SelectSingleNode来找到节点,并把节点转换为XmlElement
４，XmlElement 可以对节点的属性进行操作
注意两点：
１，
其中xDoc.SelectSingleNode("descendant::Expression[@Field='DataStore']");
SelectSingleNode参数里带有过滤条件，匹配公式是
descendant::nodename[@attribute='attributevalue']
２，xElem1 = (XmlElement)xDoc.SelectSingleNode("descendant::Expression[@Field='DataStore']");把XmlNode强制转为XmlElement,理由是XmlElement是XmlNode的子类，前者比后者提供更多好用的方法，比如属性的读和写．XmlNode除了可以转为XmlAttribute.
staticpublicstring getDataStore(string filename)string dataStoreString = string.Empty;if (!string.IsNullOrEmpty(filename))XmlDocument xDoc = newXmlDocument();XmlElement xElem1;XmlElement)xDoc.SelectSingleNode("descendant::Expression[@Field='DataStore']");if (xElem1 !=
null)"Value");return dataStoreString;
